Irresponsible and poor labor (slackers and change of admin)

This company used to have excellent services, but until the change of administration or manager, it s quality been very poor how?
We have called them a few times to have our fridge, compressor unit and everything changed, replaced, fixed and everything you can imagine. But recently, the maintenance and replacement of one of our units have become more and more frequent to the point that it can't last longer than 1 month. After calling them they refused to even come see the unit and rejected us.